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| 型號： | LTC3880EUJ-1#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.1 A DUAL SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封裝： | 6 X 6 MM, LEAD FREE, PLASTIC, WJJD-2, QFN-40 |
| 文件頁數(shù)： | 98/112頁 |
| 文件大?。?/td> | 2182K |
| 代理商： | LTC3880EUJ-1#PBF |
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LTC3880/LTC3880-1
86
3880fa
Table 9. Data Byte Contents: TON_MAX_FAULT_RESPONSE, VIN_OV_FAULT_RESPONSE,
OT_FAULT_RESPONSE, UT_FAULT_RESPONSE
BITS
DESCRIPTION
VALUE
MEANING
7:6
Response
For all values of bits [7:6], the LTC3880:
Sets the corresponding fault bit in the status commands, and
Notifies the host by asserting ALERT pin
The fault bit, once set, is cleared only when one or more of the
following events occurs:
The device receives a CLEAR_FAULTS command
The output is commanded through the RUNn pin, the
OPERATION command, or the combined action of the RUNn pin
and OPERATION command, to turn off and then to turn back on,
or
Bias power is removed and reapplied to the LTC3880
00
The PMBus device continues operation without interruption.
01
Not supported. Writing this value will generate a CML fault.
10
The device shuts down immediately (disables the output) and
responds according to the retry setting in bits [5:3].
11
Not supported. Writing this value will generate a CML fault.
5:3
Retry Setting
000-110 The unit does not attempt to restart. The output remains
disabled until the fault is cleared until the device is commanded
OFF bias power is removed.
111
The PMBus device attempts to restart continuously, without
limitation, until it is commanded OFF (by the RUNn pin or
OPERATION command or both), bias power is removed, or
another fault condition causes the unit to shut down without
retry. Note: The retry interval is set by the MFR_RETRY_DELAY
command.
2:0
Delay Time
XXX
Not supported. Values ignored
FAULT SHARING
Fault Sharing Propagation
COMMAND NAME
CMD CODE DESCRIPTION
TYPE
PAGED
DATA
FORMAT UNITS NVM
DEFAULT
VALUE
MFR_GPIO_
PROPAGATE_LTC3880
0xD2
Configuration that determines which faults are
propagated to the GPIO pins.
R/W Word
Y
Reg
Y
0x2993
MFR_GPIO_PROPAGATE_LTC3880
The MFR_GPIO_PROPAGATE_LTC3880 command enables the faults that can cause the GPIOn pin to assert low. The
command is formatted as shown in Table 10. Faults can only be propagated to the GPIO if they are programmed to
respond to faults.
This command has two data bytes.
Table 10: GPIOn Propagate Fault Configuration
The GPIO0 and GPIO1 pins are designed to provide electrical notification of selected events to the user. Some of these events are common to both output
channels. Others are specific to an output channel. They can also be used to share faults between channels.
BIT(S)
SYMBOL
OPERATION
B[15]
VOUT disabled while not decayed.
This is used in a PolyPhase configuration when bit 0 of the MFR_CHAN_CONFIG_LTC3880 is a
zero. If the channel is turned off, by toggling the RUN pin or commanding the part OFF, and then
the RUN is reasserted or the part is commanded back on before the output has decayed, VOUT
will not restart until the 12.5% decay is honored. The GPIO pin is asserted during this condition if
bit 15 is asserted.
PMBus COMMAND DETAILS
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